The Irish Queer Archive (Cartlann Aerach na hÉireann) contains the most comprehensive collection of material in Ireland relating to homosexuality in particular, and lesbian/gay, bisexual and transgender studies in general.

There are some quarter million press cuttings from the late 1960s onwards, a library of several hundred international titles (the earliest, a US title, dates from 1951), a near complete set of all lesbian/gay titles (periodicals and single issues) published since 1974 on the island of Ireland, and a fascinating collection of audiovisual material, photographs and slides, flyers, posters, badges and other ephemera.

Amongst the private papers and organisational records are the archives of Alternative Miss Ireland, the Dublin Lesbian & Gay Film Festival (GAZE), Sexual Liberation Movement (SLM), the National LGBT Federation or NXF (earlier known as NGF), Gay Health Action (GHA), the Irish Gay Rights Movement, Lesbians Organising Together (LOT), Union for Sexual Freedoms in Ireland (USFI), GLEN, Dublin LGBT Pride, Gays Against Imperialism, and GCN.

The Irish Queer Archive – a vast collection of material which provides fascinating and valuable insights into the social, cultural and political history of the LGBT communities in an Irish and international context during the latter half of the 20th century – was presented in 2008 to the National Library of Ireland following a decision to donate it by the National LGBT Federation.

IQA is a living archive and continues to accept donations and deposits.